Me, I wanted to see a classic Mandarin. Even Iron Man: Armored Adventures does a better portrayal of the Mandarin than IM3 did.

Extremis is a massive, epic moment in the Iron Man canon. To use it as a crutch to "modernize" a supposed "outdated" villian is just plain weak in an of itself. Thus, we got neither a good telling of the Extremis story, nor did we get a good portrayal of the Mandarin, and all the while AIM gets a completely foreign origin story.